Inner tube



Feb. 27, 1923. V a H.A A. LONGSHORE.

INNER TUBE: man 0131.19. 1920.

III,

Patented Feb. 27, 1923.

attesta UNHTED STATES PATENT vFTCE,

HERMAN A. LONGSHORE, OF COLUMBUS` OHIO, ASSIGNOR TO NATHANIEL G. VVARTH` .i OF COLUMBUS, OHIO.

INNER TUBE.

Application filed October 191920.v

1/ 'o all ii/omJ if may conc-era Be it known that I, Hinz-MAN A. Lexosiioicii, a citizen of the United States, resid.-

useful Inne r Tube, of which the following is a specification.

This invention relates to inner tubes 'of pneumatic tires.

Heretofore in the manufacture of some forms of so called puncture proofI or self sealing inner tubes it has been the practice to use a fabric as the tread portion of the tube or as a lamination or insert. w of this fabric in the manner` stated, however, has been The use objectionable due either to the fact that the fabric has interfered with the elasticity of the tube and prevented the tube from properly adjusting itself, when inflated, against. the wall of the' casing or, if the fabric has been too large, has caused the tube to venting pr'oper functioning'.

buckle and pinch, thereby pre- One of the objects of the present iiiveiition inner tube and is to combine a mat of fibers with the so locate it that it will not interfere with the expansion of the tube or cause its distortion and event of a p so as to qui With the foregoing and other objects in view. which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that, within the scope changes in invention sl parting 'from the .ln the ac ferred form of what is claimed, the precise embodiment of the iown can be made without despirit of the invention. companying drawings the preof the invention has been shown.

In said drawings- Figure l a tube having theY is a transverse section through present improvements combined therewith. y

Figure 2 is a View partly in side elevation and partly tube, the same being shown Figure 3 tube sealed.

Referrino` in section of a portion of the punctured.`

is-a similar view showing the to the figures by characters of designates the wall of the inner 'the layer 2, collect a film which will, in the` Serial No. 417,968.

' tube formed of cured rubber and arranged iupon the inner surface of the tread portion of this wall is a layer of uncured'rubber or other sticky plastic material indicated at 2. A layer 3 of matted fibers, preferably vegetable or niineial and of a .fluffy and fiinisy nature is affixed to the inner surface of the layer 2. @n the inner surface of this layer of' matted fibers is provided an inner layer of soft vulcanixed riibbei' shown at 4. As the soft vulcanized rubber shown at 4 is not sticky and as the surface of thostickv layer 2 is completely fibers 3, it will be obvious that these fibres 3 do not adhere to the rubber 4.

The tube is placed in a casing A as ordinarily and when inflated the pressure of the air against the inner wall,4 will r Jsult in equal distribution of the pressure against the matted fibers and against the layer of sticky plastic material, Should a nail or the like be forced into the tube, as shown in Figure 2, it will, while passing through of the soft sticky material and force this film through the puncture in the matted fibers and in the inner layer 4. -At the same time the plastic material 2, being confined between the layers l and 4 will fiow toward the nail. or other puncturing article indicated at N and pile up at the point of puncture. Vhen the nail is withdrawn it will leave a part of the ihn of plastic material 2 in the puncture in the layer 4 and will draw some of the matted fibers up through the sticky material 2 and, witha portion of said material, into the puncture in the outer wall l. The material adhering to the nail after it has been withdrawn from the wall l will be stripped off by the inner surface of the casing and allowed to pile upn the tube at the outer end of the puncture. As soon as the nail has been removed the materiall 2 will be pressed together at the point of puncture because the pressure of air against the inner layer 4 will produce lines of pressure in the material 2 such as indicated'by arrows `in Figure 3. The walls of the punctures in the layers l and 4 will also be caused to stick together because of the films of sticky material adhering thereto. and the plugging of these punctures will be further insured by the deposits' of fibers left therein the fibrous l mediate uncured solid portion upon the inner surface of the outer cured portion, an inner cured portionLand a layer of matted fibers for spacing apart the unoured portion andthe inner cured portion, Said matted layer adhering vto the uncured portion but being free from the inner cured portion.

1n testimony that I claim the foregoing as' my own, I have hereto affixed my signature in the presence of two Witnesses. n

,HERMA'N A. LONGSHORE. WitnesSes:

N. G. "WARTH,

CLYDE B. TURNER. 

